linux-kernel - Re: [PATCH v3 2/2] mmc: pwrseq: add support for Marvell SD8787 chip

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Date:   Thu, 19 Jan 2017 13:50:02 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Matt Ranostay <matt@...ostay.consulting>
Cc:     Shawn Lin <shawn.lin@...k-chips.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 2/2] mmc: pwrseq: add support for Marvell SD8787 chip

On 18 January 2017 at 08:50, Matt Ranostay <matt@...ostay.consulting> wrote:
> On Sun, Jan 15, 2017 at 6:35 PM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
>> On 2017/1/16 5:41, Matt Ranostay wrote:
>>>
>>> On Thu, Jan 12, 2017 at 11:16 PM, Shawn Lin <shawn.lin@...k-chips.com>
>>> wrote:
>>>>
>>>> On 2017/1/13 13:29, Matt Ranostay wrote:
>>>>>
>>>>>
>>>>> Allow power sequencing for the Marvell SD8787 Wifi/BT chip.
>>>>> This can be abstracted to other chipsets if needed in the future.
>>>>>
>>>>> Cc: Tony Lindgren <tony@...mide.com>
>>>>> Cc: Ulf Hansson <ulf.hansson@...aro.org>
>>>>> Signed-off-by: Matt Ranostay <matt@...ostay.consulting>
>>>>> ---
>>>>>  drivers/mmc/core/Kconfig         |  10 ++++
>>>>>  drivers/mmc/core/Makefile        |   1 +
>>>>>  drivers/mmc/core/pwrseq_sd8787.c | 117
>>>>> +++++++++++++++++++++++++++++++++++++++
>>>>>  3 files changed, 128 insertions(+)
>>>>>  create mode 100644 drivers/mmc/core/pwrseq_sd8787.c
>>>>>
>>>>> diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
>>>>> index cdfa8520a4b1..fc1ecdaaa9ca 100644
>>>>> --- a/drivers/mmc/core/Kconfig
>>>>> +++ b/drivers/mmc/core/Kconfig
>>>>> @@ -12,6 +12,16 @@ config PWRSEQ_EMMC
>>>>>           This driver can also be built as a module. If so, the module
>>>>>           will be called pwrseq_emmc.
>>>>>
>>>>> +config PWRSEQ_SD8787
>>>>> +       tristate "HW reset support for SD8787 BT + Wifi module"
>>>>> +       depends on OF && (MWIFIEX || BT_MRVL_SDIO)
>>>>> +       help
>>>>> +         This selects hardware reset support for the SD8787 BT + Wifi
>>>>> +         module. By default this option is set to n.
>>>>> +
>>>>> +         This driver can also be built as a module. If so, the module
>>>>> +         will be called pwrseq_sd8787.
>>>>> +
>>>>
>>>>
>>>>
>>>> I don't like this way, as we have a chance to list lots
>>>> configure options here. wifi A,B,C,D...Z, all of them need a
>>>> new section here if needed?
>>>>
>>>> Instead, could you just extent pwrseq_simple.c and add you
>>>> .compatible = "mmc-pwrseq-sd8787", "mmc-pwrseq-simple"?
>>>
>>>
>>> You mean all the chipset pwrseqs linked into the pwrseq-simple module?
>>
>>
>> What I mean was if you just extent the pwrseq-simple a bit, you could
>> just add your chipset pwrseqs linked into the pwrseq-simple. But if you
>> need a different *pattern* of pwrseqs, you should need a new name, for
>> instance, pwrseq-sdio.c etc... But please don't use the name of
>> sd8787? So if I use a wifi named ABC but using the same pwrseq pattenr,
>> should I include your "mmc-pwrseq- sd8787" for that or I need a new
>> mmc-pwrseq-ABC.c?
>
> Ah so pwrseq-sdio.c seems reasonable and having chipsets functions
> defined in a structure. That could be abstracted out for other
> chipsets that could needed in the future.

I think get the idea and it seems reasonable. With that in mind, I
have looked at the code once more and I got some new ideas on how to
adopt pwrseq-simple for your case.

I post the comments separately.

Kind regards
Uffe